ON THE METHOD OF DISPLACEMENT. 
199 
emetic, and afterwards the sugar. Then boil a little to form 
a syrup, marking 32° B. The antimony should not be added 
to it while in a metallic vessel. 
Although the proportions of seneka and squill are but one- 
half, yet this syrup is stronger than that of the recipe of the 
United States Pharmacopoeia. 
Upon the whole, we are satisfied as to the utility of the 
method of displacement, applied to the greatest number of 
medicinal agents which are more or less changed by decoction 
or prolonged evaporation. 
We feel satisfied that a long maceration, as directed by 
formulae in the case of tinctures, is utterly useless, if not pro- 
ductive of waste with the greatest number, and that by imme- 
diate and continued displacement we can extract the virtues 
of a plant more readily and fully than by infusion, long mace- 
ration, or decoction. 
By reference to the latest edition of the Codex Pharma- 
copee Frangaise, redacted by order of Government, in 1835, 
we find this principle adopted in a great number of prepara- 
tions. Among these are the Extracts of Liquorice, Burdock, 
Bistort, Elecampane, Gentian, Dock, Rhatany, Quassia, Bit- 
tersweet, Willow, Wormwood, Digitalis, Blessed-thistle, 
Borage, Senna, Chamomile, Belladonna, Centaury, Cicuta, 
Aconite, Hyoscyamus, Stramonium, Rue, Savine, Arnica, 
Pomegranate, Hop, Cainca, Colchicum, Columbo, Ipecac, 
Valerian, Sarsaparilla, Seneca, Jalap, Cantharides, Black 
Hellebore, and a number of others, the use of which is confined 
to Europe, and therefore of little consequence to mention. 
Of the above mentioned, some are alcoholic, and some aque- 
ous. They recommend it also in making the essential 
salt of bark. Also in the entire class of Ethereal Tinctures. 
In conclusion, we commend the subject to the notice of the 
revisors of the new Pharmacopoeia, trusting, in the hope it 
may be found worthy their attention, to see it recommended 
in their coming work. 
While upon the subject of the Pharmacopoeia, we are led 
to inquire, from having lately observed a notification in the 
